Mounting for high pressure discharge lamps



Sept. 19, 1939. J. w. MARDEN MOUNTING FOR HIGH PRESSURE DISCHARGE LAMPS Filed April 22, 193e INVENTOR Bv@ 9 gg/Q ATTORNE Patented Sept. 19, 1939 LJN-rml)Y STATES I MOUNTING Foa man ral-:ssunn ms- Y 1 CHARGE mms John Wesley Mai-den,` East Crange, N. J., assignor,

by mesne assignments, to Westinghouse Electric and Manufacturing Company, East Pittsburgh, Pa., a corporation o! Pennsylvania 4Application April 22,1936, Serial N0. 75,723

I Claims.

discharge lamps and particularly to such lamps employing a metal vapor, such as mercury. at a substantial pressure'ranging from several milli-l 5 meters to several atmospheres.

Lamps of this type are well known in the art and as is the customary practice .the lamp itself or the envelope containing the electrodes between which .the discharge occurs isvsurrounded by an outer vitreous envelope for the conservationvention to provide an electric vapor dischargel lamp of rugged construction wherein the inner envelope is so supported as to'relieve the leadingin conductors of strain.

Another'object of my present invention is the provision of an electric vapor discharge lamp'of economical construction wherein the linner envelope is supported by tubular sleeves which engage portions of the envelope so as to eliminate strain upon the leading-in conductors.

Still further objects of my present invention will become obvious to thoseskilled in the art by reference to the accompanying drawing wherein,

Figure 1 is an elevational view partly in cross Section of a lamp constructed in accordance with my present invention.

Fig. 2 is a cross sectional view taken on the '.40 une n n of Fig. 1.

Fig. 3 is a cross sectional view taken'on the line III-III of Fig. 1,

Fig. 4 is a modified form of the lamp which my present invention may take, and

Fig. 5 is a fragmentary view in perspective and on an enlarged scale of the tube support of my present invention.

Referring now to the drawing in detail I have' shown in Fig. 1 an electric vapor discharge lamp comprising an inner envelope 5 of a suitable Vitreous material, such as hard glass, quartz, pyrex,

- or the like, and surrounded by an outer envelope 6, which may be of ordinary glass as is common in the art, with the space between the inner and outer envelope either evacuated. filled with an i y (Cl. 176-122) My present invention relates to electric vapor inert gas or filled with air. The outer envelope 6 is provided with a screw base 1, of the usual commercial type, suitably cemented thereto. Secured to the shell portion of this base I is a conducting and supporting rod 8.of substantially U- 5 shaped configuration conforming substantially lto the contour of the outer envelope 8 and extending interiorly thereof adjacent to the walls.

A similar conducting and supporting rod 9 extends from the center contact point'k of the base 10 I co-axially with the longitudinal axis of the lamp and at its upper extremity is bent transversely of this axis. Thel inner envelope 6 is provided with suitable electrodes I0 and I2 to which are connected leading-in conductors I3 and I4 sealed to` `1li tubular portions I5 of the inner envelope .and extending exteriorly thereof.

The leading-in conductor I3 scaled to the upper tubular portion I5 of the inner envelope is suit-l ably connected as by 'welding to the. U-shaped.v 20 conducting and supporting rod 8 at la point coinciding with the longitudinal axis of the lamp and similarly the leading-in conductor Il is secured,

such as by we1ding,to the transversely extending portion 'of the conducting and supporting rod 9.' 25- A suitable metallic conductor I6 is spirallyv wound about the envelope 5 and is connected to the conducting and supporting rod 8 adjacent the electrode I2 f or the purpose of facilitating vstarting of the discharge'within the inner envelope 5. 30

The construction of my lamp thus far described does not' not differ materially from the prior 1 ever, to relieve the leading-in conductors I3 and 40 I4 from strain, which would otherwise render the same susceptible to disruption 'due to vibration or temperature changes, or the seal of these leading-in conductors with the tubular portions I5 ofthe envelope 5 to become destroyed, I support 45 the inner envelope 5 by a sleeve member I1'. This sleeve member I1 is formed of any suitable material, suchfor example as nickel or other metal,

or the same may be made of insulating material. These tubular sleeves engage the tubular portions I5 of the inner envelope-5 and at one end are provided with a flat extension bent at rightl angles to the longitudinal axis of the sleeve with the extremities of this fiat portion being suitably 55 connected to the respective conducting and supporting rods 8 and 5.

Thus the upper tubular sleeve I'I, as shown in Fig. l, snugly fits the upper tubular portion I5 of the envelope 5 and is welded or otherwise affixed to the conducting and supporting rod 8 at a point adjacent to the connection of the leadingin conductor I3 therewith.

Likewise the lower tubular sleeve I1 snugly ilts the lower tubular portion I5 of the envelope 5 and is similarly joined as by welding to the transversely extending portion of the conducting and insulating rod 9 adjacent the point of connection of the leading-inconductor Il therewith.

During operation of the tube the inner envelope 5, as is well known, is subjected to considerably high temperatures, naturally resulting in contraction and expansion of the vitreous envelope. In order to compensate for such contraction and expansion without subjecting the tubular portions I5 of the inner envelope 5 to the possibilities of breakage due to the surrounding tubular sleeve I1, the latter is formed as a split cylinder with a portion overlapping, as can be more readily seen in Figs. 1 and 2. This accordingly enables the tubular sleeve I1, while maintaining iirm engagement with the tubular porl tions I5 of the envelope 5 to likewise contract and expand due to temperature changes, while at the same tinie forming a rugged support for the envelope 5, which under all conditions relieves thev respective leading-in conductors I3 and I 4 from stra-in.

It thus becomes obvious to those skilled in the art that I have provided an electric vapor discharge lamp wherein the inner envelope is supported within an outer vitreous envelope in such manner as to form an economical and exceedingly rugged construction.

Moreover, the inner envelope to which the leading-in conductors for the electrodes are sealed is supported by a tubular sleeve rmly engaging portions of the envelope, which relieves the -1ead-"' ing-in conductors from all strain thus obviating the possibilities of vibration destroying the connection of the leading-in conductors or the seal thereof with the envelope.

Although I have shown and described one specific embodiment of my invention I do not desire to be limited thereto as various other modifications of the same may be made without departing from the spirit and scope of the appended claims.

What is claimed is:

l. An electric vapor discharge lamp comprising a sealed envelopeof vitreous material containing a vaporizable medium, electrodes disposed within said envelope, means for supplying electrical energy to said electrodes to cause a discharge therebetween including leading-in conductors connected to said electrodes and sealed into said vitreous envelope, and means surrounding said envelope provided with an angularly disposed portion positioned on thelongitudinal axis of said envelope and connected to said leading-in conductor, and said means extending a substantial distance longitudinally thereof in engagement with `the outer surface of said envelope ad- -jacent the point of seal of said leading-in conductors therewith for supporting said. lamp in order to eliminate strain on said leading-in conductors.

2. An electric vapor discharge lamp comprising a sealed envelope of vitreous material containing a vaporizable medium, electrodes disposed within of said envelope provided with an angularly disposed portion positionedon the longitudinal axis of said envelope and connected to said leadingin conductor, and said means extending a substantial distance longitudinally thereof in engagement with the outer surface of said envelope adjacent the point oi' seal oi' at least one of saidA leading-in conductors therewith for supporting said lamp in order to eliminate vstrain on the leading-in conductor adjacent said means.

3. An electric vapor discharge lamp comprising a sealed envelope of vitreous material containing a vaporizable medium and provided with tubular extensions, electrodes disposed within said envelope, means for supplying electrical energy to said electrodes to cause'a discharge therebetween including leading-in conductors connected to said electrodes and sealed into said vitreous envelope, and means/surrounding the tubular extensions of said envelope and in engagement therewith and mechanically connected to said leading-in conductors for supporting said lamp in order to eliminate strain on saidleading-in conductors. l 4. An electric vapor discharge lamp comprising a sealed envelope of vitreous material containing a vaporizable medium and provided withtubular extensions, electrodes disposed within said envelope between which a discharge occurs upon being supplied with electrical energy from a suitable source, leading-in conductors connected to said electrodes and sealed into said vitreous envelope, an outer vitreous envelope surrounding said sealed envelope provided with a base and having conducting and supporting rods extending from said base and connected to said leadingin conductors, and means connected to said conducting and supporting rods and engaging the tubularextensions of said sealed envelope for supporting the latter in order to eliminate strain on said leadingin conductors.

5. An electric vapor discharge lamp comprising a sealed envelope of vitreous material containing a vaporizable medium and provided with tubular extensions, electrodes disposed within said envelope between which adischarge occurs upon being supplied with electrical energy from a suitable source, leading-in conductors connected to said electrodesand sealed into said vitreous envelope, an outer vitreous envelope surrounding said sealed envelopel provided with a base and having conducting and supporting rods extending from said base and connected to said leadingin conductors, and cylindrical members connected to said conducting and supporting rods and engaging the tubular extensions of said sealed envelope for supporting the latter in order to eliminate strain on said leading-in conductors.

6. An electric vapor discharge lamp comprising velope, an outer vitreous envelope surrounding said sealed envelope provided with a base and having conducting and supporting rods extendlng from said base and connected tov said leading-in conductors, and metallic sleeves connected to said conducting and supporting rods and engaging the tubular extensions of said sealed en- 'velope for supporting the latter to relieve said envelope, an outer vitreous envelope surrounding said sealed envelope provided with a base and having conducting and supporting rods extending from said base and connected to said leading-in conductors, and a split sleeve member connected to said conducting and supporting rods and engaging the tubular extensions of said sealed envelope for supporting the latter to relieve said leading-in conductors from strain and to enable' expansion and contraction of said split sleeve 10 member with said sealed envelope.

JOHN WESLEY MARDEN. 

